入木三分

王wáng羲xī之zhī是shì历史lì shǐ上shàng最zuì有名yǒu míng的de书法shū fǎ家jiā之一zhī yī。

Wang Xizhi is one of history's most celebrated calligraphers.

他tā写xiě字zì非常fēi cháng用力yòng lì。传说chuán shuō他tā在zài木板mù bǎn上shàng写xiě字zì，工gōng匠jiàng去qù雕刻diāo kè的de时候shí hou，发现fā xiàn墨mò迹jì渗shèn进jìn了liǎo木板mù bǎn三sān分fēn深shēn。

He wrote with great force. Legend says that when he wrote on a wooden board, the craftsman found the ink had sunk three fen into the wood.

人们rén men称赞chēng zàn他tā的de字zì是shì入rù木mù三sān分fēn。

People praised his writing as 'three fen into the wood'.

后来hòu lái，人们rén men用yòng入rù木mù三sān分fēn来lái形容xíng róng分析fēn xī问题wèn tí深刻shēn kè、到位dào wèi。

Later the phrase came to describe analysis that cuts deep and true.